Theres also a paid version of AVG Mobilation Antivirus available for a flat $9.99, which eliminates ads, adds an Applocker feature to password protect access to individual apps, and includes protection against SMS spam. Or , if you want, for $3, you can just add Applocker ala carte to AVGs free version.
Although Norton Mobile Security is still in beta, its highly polished and worth a look. In addition to antivirus protection and remote locate/lock/wipe, it offers call and SMS screening and guards against phishing attempts.
Those with GSM devices (ATT and T-Mobile in the U.S.) will appreciate that Norton Mobile Security automatically locks the phone if the SIM is removed so the phone wont work with a replacement SIM.
Webroot Mobile Security Basic, the companys free offering, delivers a decent set of security features, including antivirus scanning, device locate and lock, and call and SMS blocking.
For $14.99, the app drops the Basic moniker and adds remote device wipe, a Settings Audit that checks your device for configuration vulnerabilities, and App Inspector that lets you know what data and phone features your apps have the ability to access.
For its part, Trend Micro Mobile Security is a bargain at a mere $3.99 for a one-year subscription. The catch is that is lacks any remote locate, lock, or wipe capabilities, though along with protection against viruses and malware (plus call and text filtering) it offers a fairly unique feature in the form of parental controls for Web content, which can be handy if your phone frequently finds its way into your childs hands.
In contrast to Trend Micros offering, McAfee WaveSecure, which costs $20.00 for a one year subscription, takes essentially the opposite tack: It doesnt actually provide any antivirus protection, but does offer remote location, lock and wipe (plus data backup you can initiate from your phone or from a website. (Note: The labeling of the Android Market link above is a bit misleading; though the app is listed as free, its actually a 7-day trial.)
McAfee also offers WaveSecure UPA, a free add-on module that automatically locks the phone if someone attempts to remove the WaveSecure software. (Note: If you have Android 2.2 Froyo or higher, you dont need this add-on. You can instead set WaveSecure as a device administrator via Location and Security settings by selecting device administrators.)